Former Subway spokesperson Jared Fogle (center) is led from federal court in Indianapolis, Ind., on Aug. 19, 2015. REUTERS/Susan Guyett

Former Subway spokesman-turned-convicted-sex-offender Jared Fogle gained about 30 pounds during his first three months in prison, media reports indicate. He first became famous for losing 200 pounds by eating Subway menu options nonstop, as the company's pitchman for advertising campaigns from 2000 to 2015.

"Jared's breakfast is usually Frosted Flakes with fruit or oatmeal with cake. He loves 'cake day' in the dining hall twice a week and he buys Honey Buns by the box, as well as other pastries, in the commissary on his weekly shopping day," stated a prison insider. "He's been known to eat an entire box of eight at one sitting!"

"Jared is regularly taunted by those who have it out for him," the prison insider said.

One online poster to US Weekly stated: "Going by his (Fogle) diet, he'll be dead of a major heart attack in under 15. The justice system works, sometimes."

Fogle is serving a nearly 16-year sentence after being investigated for paying for sex with minors and receiving child pornography. On Aug. 19, 2015, he agreed to plead guilty in federal court to possessing child pornography and traveling to pay for sex with minors. On Nov. 19, 2015, Fogle formally pleaded guilty to the charges and was sentenced to serve 15 years, 8 months in federal prison with a minimum of 13 years.

Fogle was born in Indianapolis, Ind. and was raised in a Jewish home. He became a bar mitzvah while on a trip to Israel, and then was confirmed by his Conservative-Reconstructionist synagogue.

In 1995, Fogle graduated from North Central High School in Indianapolis. He graduated from Indiana University in 2000 and then worked briefly in the revenue management department at American Trans Air.

Fogle first captured media attention in April 1999, via an article written by a former dorm-mate about Fogle's weight loss and published in the Indiana Daily Student. Subsequently, Fogle was featured in a Men's Health magazine article, "Stupid Diets... that Work!"

Days before Fogle was sentenced to prison, his divorce with his former wife, Kathleen, was finalized. She had custody of their two young children,Brady and Quinn.